K₂Ho(PO₄)(WO₄)

Abstract

A new compound, dipotassium holmium(III) phosphate(V) tungstate(VI), K2Ho(PO4)(WO4), has been obtained during investigation of the K2O–P2O5–WO3–HoF3 phase system using the flux technique. The compound is isotypic with K2Bi(PO4)(WO4). Its framework structure consists of flat ∞ 2[HoPO4] layers parallel to (100) that are made up of ∞ 1[HoO8] zigzag chains inter­linked via slightly distorted PO4 tetra­hedra. WO4 tetra­hedra are attached above and below these layers, leaving space for the K+ counter-cations. The HoO8, PO4 and WO4 units exhibit 2 symmetry.

K2Ln(PO4)(WO4):Tb3+,Eu3+ (Ln = Y, Gd and Lu) phosphors: highly efficient pure red and tuneable emission for white light-emitting diodes

“…Here, the crystal structure data of K 2 Ho(PO 4 )(WO 4 ) is used as a starting model to rene the crystal structure. 35 As presented in Fig. 1, the observed and calculated patterns of K 2 Ln(PO 4 )(WO 4 ) are shown with the unit cell crystal structure.…”

“…70) space group with an orthorhombic crystal system (ICSD-260054). 35 However, no records of K 2 Y(PO 4 )(WO 4 ), K 2 Gd(PO 4 )(WO 4 ) or K 2 Lu(PO 4 )(WO 4 ) are available in the Inorganic Crystal Structure Database (ICSD) or Joint Committee on Powder Diffraction Standards (JCPDS). Solid solutions of K 2 Ln(PO 4 )(WO 4 ) (Ln ¼ Y, Gd and Lu) may also exist due to the similar radii and valencies of the rare earth ions.…”

“…In K 2 Ho(PO 4 )(WO 4 ), the [Ln 3+ -O 2À -Ln 3+ ] unit is separated by [PO 4 ] 3À and [WO 4 ] 2À functional groups, such that a high quenching concentration is expected in both structures. 34,35 The vacuum ultraviolet, cathodoluminescence and up conversion were studied for K 2 Y(PO 4 )(WO 4 ). 36 However, the energy transfer (ET) effect of Tb 3+ and Eu 3+ in K 2 Ln(PO 4 )(WO 4 ) under NUV excitation is unknown, and to the best of our knowledge, K 2 Lu(PO 4 )(WO 4 ) has never been synthesized.…”

Multi-wavelength excited white-emitting K2Gd(1−x)(PO4)(WO4):xDy3+ phosphors with satisfactory thermal properties for UV-LEDs

“…The initial structural model for the renement was established by the standard crystallographic data of K 2 Ho(PO 4 )(WO 4 ) (ICSD#206654) compound which has an orthorhombic structure with space group Iabc. 16 All the atom positions, fraction factors, thermal vibrational parameters, and background were converged and rened. The crystallographic data is presented in Table 1 and the rened atomic coordinate parameters are presented in Table 2.…”

Structural, Luminescence, and Electronic Properties of Potassium Holmium Cyclotetraphosphate KHoP4O12: Experiment and Theory

“…The tunnel structure indicates that crystal KHoP 4 O 12 has potential applications in shape-selective catalysis, absorbents, ion-ex- (Table 3) are consistent with those reported previously. [13,21] The isolation of HoO 8 polyhedron (Figure 2) gives rise to the large Ho-Ho distances, the shortest one of which is around 5.9942(9) Å, as it can be observed in LiHoP 4 O 12 [5.570 (1) Å]. [22] This possibly results in the decreased interaction of Ho-Ho.…”